The Wacker Neuson Seal is a genuine OEM seal designed for the APT4S and APT4T pump series, including cold weather variants. As a factory-sourced component, it meets the exact material and dimensional specifications set by Wacker Neuson for these pumps. This seal is compatible across the full APT4S and APT4T lineup — covering surge brake, electric brake, and cold weather configurations. Keeping the correct seal in service is essential for maintaining pump integrity and preventing fluid loss during operation.
Key Features
- OEM Material Specification — Manufactured to Wacker Neuson's exact compound and compression tolerances for this pump seal application, ensuring a proper seat and lasting sealing performance.
- Drop-In Replacement — Engineered to the same dimensional profile as the original, allowing straightforward installation without rework or fitment adjustments.
- Broad APT Series Coverage — Fits APT4S and APT4T pump models in standard and cold weather configurations, including both surge brake and electric brake variants.
- Leak Prevention — A correctly functioning seal keeps fluid contained within the pump circuit; a worn or failed seal leads to fluid loss, pressure drop, and potential pump damage.
- Cold Weather Rated Variants Supported — Confirmed fit for cold weather (CW) designated models, making this a reliable choice for year-round and low-temperature service environments.
A seal in a diaphragm or piston pump serves as the barrier between pressurized fluid and the surrounding components, maintaining the internal pressure needed to move liquid efficiently. When a seal degrades or fails, fluid can bypass its intended path, causing a drop in output pressure, contamination of adjacent components, or outright fluid leakage. Replacing a worn seal promptly restores the pump's ability to hold pressure and deliver consistent flow.
Part Details
| Part Number | 5200019902 |
|---|---|
| Brand | Wacker Neuson |
| Part Type | Genuine OEM |
| Description | Seal |
Compatibility & Fitment
| Name | Model | Machine Number |
|---|---|---|
| APT4S Pump w/Skid | APT4S | 5200018977 |
| APT4T Pump, Surge Brake | APT4T | 5200019643, 5200019644 |
| APT4T Pump, Surge Brake, Cold Weather | APT4T CW | 5200019792, 5200019793 |
| APT4S Pump w/Skid, Cold Weather | APT4S CW | 5200019798 |
Verify Before You Order
Fitment is machine-number and revision-specific; always confirm your model and serial number against the fitment list.
Why Buy From DHS Equipment
Every part is verified against the manufacturer's part number before it ships, so what you order is what arrives. We carry parts from leading OEM brands and our own DHS Quality Parts line of professional aftermarket components. Need help finding the right part? Our team is available to confirm compatibility whenever you need it. Orders are processed fast to keep your jobs on track. We don't just sell parts. We keep you jobsite ready.
Questions? Contact our team at [email protected] or 866-611-9369 — DHS Equipment is here to help you maintain peak performance.
